The average adult Chubbit was shorter than a fully-grown Human being. Their skin or scales appeared to be green though some also had black spots which might have been a genetic trait. Little else about their physiology is known other than their nervous systems were easily crippled by ultra-strong frequency waves and that they were able to survive in Aridus's ionized atmosphere. They also appeared to have five opposable digits on their hands. Due to the barren and harsh conditions of their homeworld, the Chubbits apparently did not have an advanced space-age civilization.
During the dark times after Palpatine's ascension, numerous Chubbits were held in slavery by a T'surr gang on one of the moons of Telerath. Fugitive JediDass Jennir, in his mission to end the tyranny of the local gang wars, freed both the Chubbits and their fellow Nosaurian slaves. Jennir instructed the freed beings to take the slavers' ships for their own and to make new lives for themselves.
Imperial troops scouted Aridus during the early days of the Galactic Empire. After valuable natural resources were found beneath the surface on the barren planet, various mining conglomerates including Yutrane-Trackata set up operations on Aridus . However, Aridus's ionized atmosphere damaged the mining equipment.
Unwilling to waste credits by scrapping all operations on Aridus, the sector Moff authorized the construction of a massive power transformer and signal amplifier—the Iron Tower. The operations resumed and Imperial Hover-trains transported workers to dig sites. In a bid to prove its loyalty, Yutrane-Trackata offered the Empire sole use of its mining vehicles and other heavy equipment.
Unfortunately, the Iron Tower's ultra-strong frequency waves crippled the nervous systems of the native Chubbits, thus killing many of the species. The Chubbits had already been disenfranchised by the Imperial colonization and were forced to wage a guerrilla war on the Empire. However, several sympathetic Yutrane-Trackata workers surreptitiously supplied Chubbit resistance fighters and members of the Alliance to Restore the Republic with military weapons, including blasters, and repulsor and crawler tanks.
In 0 ABY, the Iron Tower was destroyed by an impersonator of Obi-Wan Kenobi as part of a ploy by Darth Vader to lure Luke Skywalker into a trap at the Iron Tower. However, the destruction of the Tower presumably ended the nerve-crippling emissions and saved the lives of many other Chubbits.
Dark Times 11 features a short-statured reptilian race on a desert world. Although the text of the comic does not explicitly identify these creatures as Chubbits, a previous page indicates that the Uhumele is traveling "in the Expansion Region, near Aridus".